Cisco
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
At a glance
Actively exploited in the wild — prioritise confirming exposure.
High rather than Critical: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Cisco Secure Firewall Threat Defense, treat it as Critical.
Briefing
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Do we run Cisco Secure Firewall Threat Defense and GitLab Community Edition and Enterprise Edition, and which versions?
- Is any of it reachable from the internet?
- Have we checked whether it has already been used against us?
- If it is still not patched, what mitigation is in place, and what is holding the fix up?
Next steps
- Confirm exposure and remediation status for affected products
Vulnerability facts
Full CVE detail CVE-2026-76418- 8.6 · HighExploitable over the network without any account, and no one has to click or open anything. High impact on availability, and it can reach beyond the vulnerable system.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Listed: attacks using it have been seen (on the catalogue since )
- ~0.8% estimated chance of attack in 30 days
These facts are for CVE-2026-76418. This event covers 1 more CVE, each with its own record.
No technical write-up beyond these facts and the summary below yet.
Next steps
- Confirm whether affected products/versions are present and prioritise patching or mitigations
Summary
- CISA has added two new vulnerabilities to its known-exploited catalogue, based on evidence of active exploitation.
- CVE-2026-76418 is confirmed as exploited in the wild (US known-exploited catalogue)
- CVE-2026-76418 has an estimated ~0.8% chance of attack in 30 days (57.3th percentile) as of 2026-11-02 — probability signal, not confirmed exploitation
- Authoritative catalogues report active exploitation of this vulnerability.
Products and services involved
- Cisco Secure Firewall Threat Defense93% match confidence · CVE-2026-76418
- GitLab Community Edition and Enterprise Edition98% match confidence · CVE-2026-76418
Same event, different frames
Distinct often headline the same incident differently.
Pulse
Last checked yesterday · Recheck overdue since 8 Nov 2026, 10:10 UK time
in the next 30 days rose from 27.3% to 65.2%.
rose materially — review inventory match and patch cadence.
Sources
- SecurityWeekNews
Attackers Exploit Second Cisco Firewall VPN Zero-Day Since August
CVE-2026-76418: Cisco Secure Firewall Zero-Day Exploited in SSL VPN Attacks
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
- CISA Cybersecurity AdvisoriesOfficial
CISA Adds Two Known Exploited Vulnerabilities to Catalog
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
- ProbableSummary fact75% confidence
CISA has added two new vulnerabilities to its known-exploited catalogue, based on evidence of active exploitation.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-76418
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2026-76418 is confirmed as exploited in the wild (US known-exploited catalogue)
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-76418 has an estimated ~0.8% chance of attack in 30 days (57.3th percentile) as of 2026-11-02 — probability signal, not confirmed exploitation
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-97229
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2026-97229 is confirmed as exploited in the wild (US known-exploited catalogue)
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-97229 has an estimated ~27.3% chance of attack in 30 days (98.1th percentile) as of 2026-11-02 — probability signal, not confirmed exploitation

